CN101133575B - System and method for subcarrier modulation in ISM band as supervisory channel - Google Patents
System and method for subcarrier modulation in ISM band as supervisory channel Download PDFInfo
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Abstract
Apparatus and method for transmitting a supervisory signal for optical network applications. The apparatus includes a subcarrier transmission system configured to receive a first supervisory signal and output a second supervisory signal, and an electrical-to-optical conversion system configured to receive the second supervisory signal and. a data signal and output an optical signal. The second supervisory signal is associated with a subcarrier frequency. The data signal is associated with a data bandwidth, and the data bandwidth includes a data frequency. At the data frequency, a power density of the data signal is substantially equal to zero. A ratio of the subcarrier frequency to the data frequency ranges from 0.8 to 1, and the subcarrier frequency ranges from 2.4 GHz to 2.483 GHz.
Description
Technical field
The present invention relates to the telecommunication technology field, being specifically related to sub-carrier modulation is the system and method for monitoring and controlling channels.In cited embodiment, the present invention is applied to optical-fiber network, but need to prove, practical ranges of the present invention is more wide.
Background technology
Telecommunication technology has experienced years of development and progress.Now, optical-fiber network has been applied in traditional telecommunication service, such as speech business and other application.Optical-fiber network can transmit the multiple signal with different capabilities, for example, and the transmission signal that ONT Optical Network Terminal signal, low speed define in multiplexed signals, switching signal and the network at a high speed etc.
In order to monitor these signals, optical-fiber network often comes streams of trace data through a plurality of nodes, exchange website and link.For example, optical-fiber network provides the pilot signal with data signal propagation.These pilot signals are provided for safeguarding and detecting the information of optical-fiber network.Some conventional arts can be used for transmission and receive these pilot signals.
In dense wave division multipurpose (DWDM) system, use based on the individual channel of the outer wavelength of frequency ranges of data and transmit this pilot signal.For example, this monitoring and controlling channels is positioned at data wave band outer 1510 nanometers or 1620 nano wave lengths, and the data wave band often is positioned at C-band or the L-band scope from 1570 nanometers to 1610 nanometers from 1530 nanometers to 1562 nanometers.If dispose and all data channels are born the cost of monitoring and controlling channels jointly at most of wavelength channels, then this transmission means is a good solution.But in a lot of actual conditions, especially in metropolitan area wavelength division multiplexing (WDM) is used, always only dispose the channel of minority.Like this, the cost of separate wdm supervisory channel is just very important, so this scheme is not practiced thrift cost.
The method that another kind carries pilot signal is to use frequency division multiplexing (FDM) mechanism.Frequency-division multiplexing method comes the transmitting, monitoring signal through subcarrier.Pilot signal is normally generated by same transmitter and shared identical wavelength with data-signal.The subcarrier frequency of monitoring and controlling channels is outside the bandwidth of data-signal.For example, for the base band data speed of the highest 2.5Gbps, subcarrier frequency probably is 3GHz.In order to adapt to higher subcarrier frequency, transmitter and receiver need have than the only higher frequency response of transmission of data signals.So just need many non-standard and expensive assemblies.For example, can detect the signal of monitoring and controlling channels with high speed receiver independently.
Likewise, pilot signal also can use low frequency subcarrier or " pilot tone " to transmit.Subcarrier frequency is reduced to the cost and realization difficulty that can reduce assembly in kHz or the MHz scope, but the also corresponding reduction of the performance of this pilot signal.
Therefore, the new technology of exigence development transmission and reception pilot signal.
Summary of the invention
The present invention relates generally to the telecommunication technology field, being specifically related to sub-carrier modulation is the system and method for monitoring and controlling channels.In listed examples, the present invention is applied to optical-fiber network, but need to prove, practical ranges of the present invention is more wide.
One embodiment of the present of invention have proposed a kind of device that is used to handle the optical-fiber network pilot signal, and said device comprises: the subcarrier transmission system is used to receive first pilot signal and exports second pilot signal; The electric light converting system is used to receive said second pilot signal and first data-signal and exports first light signal; In addition, said device also comprises: photo-translating system is used to receive said first light signal and exports first signal of telecommunication and second data-signal; The subcarrier receiving system is used to receive said first signal of telecommunication and exports the 3rd pilot signal; Wherein said second pilot signal is relevant with first subcarrier frequency; Said first data-signal is relevant with first data bandwidth, and said first data bandwidth comprises first data frequency; The power density of said first data-signal on said first data frequency near 0; The ratio ranges of said first subcarrier frequency and said first data frequency is 0.8～1; Said first light signal is relevant with the disturbance of said first data-signal, and said disturbance is less than or equal to 1dB; Said first light signal is relevant with the signal to noise ratio of said first pilot signal, and said signal to noise ratio is more than or equal to 20dB.Said first pilot signal is relevant greater than first subcarrier of 1Mbps with data rate.
Another embodiment of the present invention has proposed a kind of device that is used to handle the optical-fiber network pilot signal, comprising: the subcarrier transmission system is used to receive first pilot signal and exports second pilot signal; The electric light converting system is used to receive said second pilot signal and first data-signal and exports first light signal; Said device further comprises: photo-translating system is used to receive said first light signal and exports first signal of telecommunication and second data-signal; The subcarrier receiving system is used to receive said first signal of telecommunication and exports the 3rd pilot signal; Said device further comprises: the photosystem that is connected to said electric light converting system and photo-translating system; Said second pilot signal is relevant with first subcarrier frequency; Said first data-signal is relevant with first data bandwidth; Said first data bandwidth comprises: first data frequency, the power density of said first data-signal on said first data frequency near 0; The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1.
Another embodiment of the present invention has proposed a kind of method that is used to handle the optical-fiber network pilot signal; Comprise: receive first pilot signal; Handle and the relevant information of said first pilot signal, then at least based on exporting second pilot signal with the relevant information of said first pilot signal.Said method further comprises: receive said second pilot signal and first data-signal; Handle and said second pilot signal and the relevant information of said first data-signal, export first light signal based on the relevant information of said second pilot signal and said first data-signal at least then.Said method further comprises: receive said first light signal, handle and the relevant information of said first light signal, then at least based on exporting first signal of telecommunication and second data-signal with the relevant information of said first light signal.Said method further comprises: receive said first signal of telecommunication, handle and the relevant information of said first signal of telecommunication, export the 3rd pilot signal then.Said second pilot signal is relevant with first subcarrier frequency; Said first data-signal is relevant with first data bandwidth.Said first data bandwidth comprises: first data frequency, the power density of said first data-signal on said first data frequency near 0.The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1.
Another embodiment of the present invention has proposed a kind of device that is used to transmit the optical-fiber network pilot signal, comprising: the subcarrier transmission system is used to receive first pilot signal and exports second pilot signal; The electric light converting system is used to receive said second pilot signal and first data-signal and exports first light signal.Said second pilot signal is relevant with first subcarrier frequency; Said first data-signal is relevant with first data bandwidth.Said first data bandwidth comprises: first data frequency, the power density of said first data-signal on said first data frequency near 0.The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1.
Another embodiment of the present invention has proposed a kind of device that is used to receive the optical-fiber network pilot signal, comprising: photo-translating system is used to receive first light signal and exports first signal of telecommunication and second data-signal; The subcarrier receiving system is used for receiving said first signal of telecommunication and exports the 3rd pilot signal.Said subcarrier receiving system comprises: the band pass filter relevant with first subcarrier frequency, said second data-signal is relevant with first data bandwidth.Said first data bandwidth comprises maximum data frequency.The ratio span of said first subcarrier frequency and maximum data frequency is 0.8～1.
Another embodiment of the present invention has proposed a kind of method that is used to transmit the optical-fiber network pilot signal; Comprise: receive first pilot signal; Handle and the relevant information of said first pilot signal, then at least based on exporting second pilot signal with the relevant information of said first pilot signal.Said method further comprises: receive said second pilot signal and first data-signal; Handle and said second pilot signal and the relevant information of said first data-signal, then at least based on exporting first light signal with said second pilot signal and the relevant information of said first data-signal.Said second pilot signal is relevant with first subcarrier frequency; Said first data-signal is relevant with first data bandwidth.Said first data bandwidth comprises: first data frequency, the power density of said first data-signal on said first data frequency near 0.The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1.
Another embodiment of the present invention has proposed a kind of method that receives the optical-fiber network pilot signal; Comprise: receive first light signal; Handle and the relevant information of said first light signal, then at least based on exporting first signal of telecommunication and second data-signal with the relevant information of said first light signal.Said method further comprises: receive said first signal of telecommunication, handle and the relevant information of said first signal of telecommunication, export the 3rd pilot signal then.The said process information relevant with first signal of telecommunication comprises said first signal of telecommunication of filtration, and filtration first subcarrier frequency relevant with said first signal of telecommunication.Said second data-signal is relevant with first data bandwidth; Said first data bandwidth comprises maximum data frequency.The ratio span of said first subcarrier frequency and maximum data frequency is 0.8～1.
Use embodiments of the invention, can obtain the benefit that a lot of conventional arts can't be realized.For example, embodiments of the invention use the subcarrier frequency of the peak frequency that is lower than data- signal 250 or 450 frequency bands slightly, and the rear portion of this subcarrier power spectrum and data power spectrum is overlapping.The data power density at this rear portion is lower than the low-frequency data power density.For example, this low frequency is in kHz or MHz scope.Some embodiment of the present invention provides subcarrier signal, itself and said data-signal shared portion or all photoelectric signal converter, electro-optical signal converter and other photoelectricity or electric light transition components.Embodiments of the invention greatly reduce transmission and receive the cost of pilot signal.Some embodiment of the present invention provides at f
ScLow data power density.Said pilot signal has higher signal to noise ratio and can be with higher speed rates, for example, and to be higher than the speed rates of 1Mbps.Embodiments of the invention provide sub-carrier modulation by a narrow margin.Main data channel only receives very little disturbances.For example, to the disturbance of luminous power less than 1dB.Some embodiment of the present invention provides easy configuration to realize with simplifying.
Another embodiment of the present invention has proposed a kind of device that is used to handle the optical-fiber network pilot signal, comprising: the subcarrier transmission system is used to receive first pilot signal and exports second pilot signal; The electric light converting system is used to receive said second pilot signal and first data-signal and exports first light signal; Photo-translating system is used to receive said first light signal and exports first signal of telecommunication and second data-signal.The device of said processing optical-fiber network pilot signal further comprises: the subcarrier receiving system is used to receive said first signal of telecommunication and exports the 3rd pilot signal; Photosystem is connected in said electric light converting system and said photo-translating system.Said second pilot signal is relevant with first subcarrier frequency.Said first data-signal is relevant with first data bandwidth; Said first data bandwidth comprises first data frequency.At said first data frequency, the power density of said first data-signal is substantially equal to 0.The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1, and the said first subcarrier frequency scope is 2.4GHz～2.483GHz.
Another embodiment of the present invention has proposed a kind of method that is used to handle the optical-fiber network pilot signal; Comprise: receive first pilot signal; Handle and the relevant information of said first pilot signal; At least based on exporting second pilot signal, receive said second pilot signal and first data-signal then with the relevant information of said first pilot signal.Said method further comprises: handle and said second pilot signal and the relevant information of said first data-signal; At least based on exporting first light signal, receive said first light signal and processing and the relevant information of said first light signal then with said second pilot signal and the relevant information of said first data-signal.Said method further comprises: based on exporting first signal of telecommunication and second data-signal with the relevant information of said first light signal, receive said first signal of telecommunication at least, handle the information relevant with said first signal of telecommunication then and export the 3rd pilot signal.Said second pilot signal is relevant with first subcarrier frequency.Said first data-signal is relevant with first data bandwidth; Said first data bandwidth comprises first data frequency.At said first data frequency, the power density of said first data-signal is substantially equal to 0.The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1, and the said first subcarrier frequency scope is 2.4GHz～2.483GHz.
Another embodiment of the present invention has proposed a kind of device that is used to transmit the optical-fiber network pilot signal, comprising: the subcarrier transmission system is used to receive first pilot signal and exports second pilot signal; The electric light converting system is used to receive said second pilot signal and data-signal and exports light signal.Said second pilot signal is relevant with subcarrier frequency.Said data-signal is relevant with data bandwidth; Said data bandwidth comprises data frequency.At said data frequency, the power density of said data-signal is substantially equal to 0.The ratio span of said subcarrier frequency and said data frequency is 0.8～1, and said subcarrier frequency scope is 2.4GHz～2.483GHz.
Another embodiment of the present invention has proposed a kind of device that receives the optical-fiber network pilot signal, comprising: photo-translating system is used for receiving optical signals and exports the signal of telecommunication and data-signal; The subcarrier receiving system is used to receive the said signal of telecommunication and output monitoring signal.Said subcarrier receiving system further comprises the band pass filter relevant with subcarrier frequency.Said data-signal is relevant with data bandwidth; Said data bandwidth comprises data frequency.At said data frequency, the power density of said data-signal is substantially equal to 0.The ratio span of said subcarrier frequency and said data frequency is 0.8～1, and said subcarrier frequency scope is 2.4GHz～2.483GHz.
Embodiments of the invention have lot of superiority.Embodiments of the invention can realized high-performance under the condition cheaply.Some embodiment of the present invention uses for wireless communication industry at commercial available radio frequency (RF) transmitter and radio-frequency transmitter.The radio communication of for example, in the ISM frequency band, carrying out.Said radio frequency sending set and radio-frequency transmitter comprise integrated circuit (IC) chip.These IC chips can be that optical communication provides superior performance with the low price.
Hereinafter will combine detailed description of the present invention and accompanying drawing, prove absolutely the object of the invention, feature and advantage that multiple preceding text are not mentioned.
Description of drawings
Fig. 1 is that the conventional optical network of simplifying in the prior art connects sketch map.
Fig. 2 is that the optical-fiber network of simplifying in the embodiment of the invention connects sketch map.
Fig. 3 is that the conventional optical network of simplifying in the prior art connects sketch map.
Fig. 4 is that the optical-fiber network of simplifying in another embodiment of the present invention connects sketch map.
Fig. 5 is the power spectrum sketch map of data-signal and pilot signal in the embodiment of the invention.
Fig. 6 is the power spectrum sketch map of subcarrier signal simplification in the embodiment of the invention and the frequency band limits characteristic sketch map that band pass filter is simplified.
Fig. 7 is the sketch map that transmits and receive signal in the ISM frequency band of simplifying in the prior art.
Fig. 8 is that the optical-fiber network of simplifying in another embodiment of the present invention connects sketch map.
Fig. 9 is that the optical-fiber network of simplifying in another embodiment of the present invention connects sketch map.
Embodiment
The present invention relates to the telecommunication technology field, being specifically related to sub-carrier modulation is the system and method for monitoring and controlling channels.In listed examples, the present invention is applied to optical-fiber network, but need to prove, practical ranges of the present invention is more wide.
In low frequency, subcarrier can be modulated to monitoring and controlling channels.Because subcarrier frequency and main data spectrum are overlapping, thus the latter for subcarrier signal just as a high-level noise source.Because receive the restriction of the high spectrum density of data-signal, low-frequency subcarrier modulation is generally supported the pilot signal of kbps rank transmission rate.For example, monitoring and controlling channels has the transmission rate of 9.6kbps.In the optical-fiber network in modern times, terminal node requires the communication more at a high speed than kbps usually.
Fig. 1 connects sketch map for the conventional optical network of simplifying.Optical-fiber network connects 100 and comprises transmitter system 110, receiver system 120 and optical link 130.Transmitter system 110 further comprises electro-optical signal converter 112.Receiver system 120 further comprises photoelectric signal converter 122 and clock and data recovery system 124.Said photoelectric signal converter is used to receive data-signal 140.At transmitter system 110, data-signal is converted into light signal 142.Light signal 142 is received by receiver system 120 through optical link 130 transmission then.For example, optical link 130 comprises optical fiber.At receiver system 120, light signal 142 is converted into the signal of telecommunication 144, in this process through regular meeting's generation signals distortion.Can reduce distorted signals through clock and data recovery system 124.Clock and data recovery system 124 generates data-signal 146, and data-signal 146 can be regarded the backup of data-signal 140 as.
Fig. 2 is that the optical-fiber network of simplifying in the embodiment of the invention connects sketch map.This only is an example, should not regard the restriction to claim protection range of the present invention as.Those skilled in the art should know various variant of the present invention, be equal to replacement and modification.Light connects 200 and comprises transmitter system 210, receiver system 220 and optical link 230.Transmitter system 210 further comprises electro-optical signal converter 212, radio frequency band filter 214 and radio-frequency modulator 216.Receiver system 220 further comprises photoelectric signal converter 222, radio frequency band filter 224, RF demodulator 226 and clock and data recovery system 228.For example, radio frequency band filter 214 is formed subcarrier transmitter system with radio-frequency modulator 216.For another example, radio frequency band filter 224 is formed the subcarrier receiver system with RF demodulator 226.Although above content with system 210,212,214,216,220,222,224,226,228 and 230 explanations, still has various variants, is equal to replacement and modification.Some system can merge each other.Other system can be added to light and connect in 200.According to the difference of embodiment, can substitute one or more systems.Below these systems will be described in further detail.
Radio-frequency modulator 216 receives pilot signal 240 and modulated RF source 270.For example, generate pilot signal 240 by control circuit.For another example, radio frequency source 270 has the frequency of about 2.4GHz.In radio-frequency modulator 216, according to base band supervisory signal 240 modulated radio signals.Modulation format can be amplitude shift keying method (ASK), frequency shift keying (FSK) or phase-shift keying (PSK).The subcarrier signal that modulation obtains is through radio frequency band filter 214.This radio frequency band filter 214 has centre frequency and the equal transmission bandwidth of supervisory signal bandwidth that equates with radio frequency source 270.
At electro-optical signal converter 212, data-signal 250 merges with subcarrier signal 242.Signal after the merging is converted into light signal 260.For example the frequency of subcarrier signal 242 is positioned at the frequency response range of electro-optical signal converter 212.For another example, electrical to optical converter 212 has the frequency response range that is up to 2.5Gbps.And for example, electro-optical signal converter 212 is analogue systems, and its output signal and input signal match.Light signal 260 is stacks of the corresponding luminous power of data-signal 250 and the luminous power of subcarrier signal 242 correspondences.Aspect luminous power, the ratio span of subcarrier signal 242 and data-signal 250 is 1%～10%.This ratio also often is called as subcarrier modulation depth.
Fig. 3 connects sketch map for the conventional optical network of simplifying.Optical-fiber network connects 300 and comprises transmitter system 310, receiver system 320 and optical link 330.Transmitter system 310 further comprises lasing light emitter 312 and electro-optical signal modulator 314.Receiver system 320 further comprises photoelectric signal converter 322 and clock and data recovery system 324.Lasing light emitter 312 provides continuous wave (CW) light 380 for electro-optical signal modulator 314, and for example, lasing light emitter 312 further comprises laser diode.Modulator converts light signal 342 to the data-signal 340 modulated continuous wave light 380 that receive and with the data-signal that receives 340.Light signal 342 receives through optical link 330 transmission and by receiver system 320.For example optical link 330 comprises optical fiber.At receiver system 320, light signal 342 is converted into the signal of telecommunication 344, in this process through regular meeting's generation signals distortion.Can reduce distorted signals through clock and data recovery system 324.Clock and data recovery system 324 generates data-signal 346, and this data-signal 346 is backups of data-signal 340.
Fig. 4 is that the optical-fiber network of simplifying in another embodiment of the present invention connects sketch map.This only is an example, should not regard the restriction to claim protection range of the present invention as.Those skilled in the art should know various variant of the present invention, be equal to replacement and modification.Light connects 400 and comprises transmitter system 410, receiver system 420 and optical link 430.Transmitter system 410 further comprises lasing light emitter 412, electro-optical signal modulator 414, radio frequency band filter 416 and radio-frequency modulator 418.For example lasing light emitter 412 further comprises laser diode.Receiver system 420 further comprises photoelectric signal converter 422, radio frequency band filter 424, RF demodulator 426 and clock and data recovery system 428.For example, radio frequency band filter 416 is formed subcarrier transmitter system with radio-frequency modulator 418.For another example, radio frequency band filter 424 is formed the subcarrier receiver system with RF demodulator 426.Although above content is by system 410,412,414,416,418,420,422,424,426,428 and 430 explanations, embodiments of the invention still have various variants, are equal to replacement and modification.Some system can merge each other.For example, lasing light emitter 412 and electro-optical signal modulator 414 are combined.Other system can be added to light and connect in 400.According to the difference of embodiment, can substitute one or more systems.Below these systems will be described in further detail.
Radio-frequency modulator 418 receives pilot signal 440 and modulated RF source 470.For example, generate pilot signal 440 by control circuit.In radio-frequency modulator 418, according to base band supervisory signal 440 modulated radio signals.Modulation format can be amplitude shift keying method (ASK), frequency shift keying (FSK) or phase-shift keying (PSK).The subcarrier signal that modulation obtains is through radio frequency band filter 416.This radio frequency band filter 416 has the centre frequency that equates with radio frequency source 470, and the transmission bandwidth that equates with supervisory signal bandwidth.
Lasing light emitter 412 receives subcarrier signal 442 and generates laser signal 480.The intensity of subcarrier signal 442 modulated laser signals 480, for example, lasing light emitter 412 comprises laser diode.Need laser signal be provided for electro-optical signal modulator 414.The data-signal 450 that modulator 414 usefulness receive is modulated these laser signals and is converted the data-signal that receives 450 to light signal 452.For example, the frequency range of subcarrier signal 442 is at 2.4GHz～2.5GHz, and this frequency range belongs to the frequency response range of lasing light emitter 412 and electro-optical signal modulator 414.For another example, subcarrier modulation depth is 1%～10%.
Of Fig. 2 and Fig. 4, data- signal 250 and 450 is respectively the noise of subcarrier signal 240 and 440.In subcarrier frequency, data- signal 250 and 450 spectrum density necessarily are lower than the spectrum density of subcarrier signal 240 and 440 respectively.
Of Fig. 2 and Fig. 4, data-signal 250 or the transmission of 450 usefulness non-return-to-zero (NRZ) forms.In the non-return-to-zero form, binary zero is corresponding-1.0 volts in the output 262 or 462 of photoelectric signal converter 222 or 422, binary one correspondence+1.0 volts.Data- signal 250 or 450 average power are:
Wherein R is the output load impedance of photoelectric signal converter 222 or 422.For example, the value of R can be about 50 ohm.Data- signal 250 or 450 and subcarrier signal 240 or 440 according to the stack of following formula:
Wherein, V
Sc, A
ScAnd f
ScBe respectively voltage, amplitude and the frequency of subcarrier signal 240 or 440.
representes constant phase, t express time.Can be through modulating A with amplitude shift keying method (ASK)
Sc, or through modulating f with frequency shift keying (FSK)
Sc, or through modulating with phase-shift keying (PSK)
Transmitting subcarrier signal 240 or 440.For frequency shift keying or phase shift keying, A
ScBe constant.The average power of subcarrier signal is:
In order to reduce the disturbance of data- signal 240 or 440, need limit subcarrier signal 240 or 440 respectively, make to be no more than ± 20% broadening in output 262 or 462 " 0 " and " 1 ".Particularly,
A
SC=20% * 1.0=0.2 (volt) (formula 4)
Above-mentioned disturbance generally can cause 1 decibel of general in telecommunication industry eye pattern opening and closing degree.This 1 decibel of eye pattern opening and closing degree generally can cause the sensitivity of receiver to reduce by 1 decibel.Correspondingly, subcarrier signal 240 or 440 maximum power are:
Therefore, subcarrier signal 240 or 440 maximum power should be no more than 2% of data- signal 250 or 450 average powers.When the sub-carrier modulation use should limit, can limit to confirm the maximum rate of subcarrier with signal to noise ratio (snr).
For subcarrier transmission in the band, subcarrier frequency is positioned at the frequency band of data-signal 250 or 450.Data- signal 250 or 450 frequency spectrum are the noise of subcarrier signal 240 or 440.Therefore, the signal to noise ratio of subcarrier signal is confirmed by the ratio of subcarrier signal spectrum density and data-signal spectrum density.
Fig. 5 is the simplification power spectrum sketch map of data-signal and pilot signal in the embodiment of the invention.Power spectrum among Fig. 5 can be realized by system 200 described in Fig. 2 or Fig. 4 or system 400 respectively.Fig. 5 only is an example, should not regard the restriction to claim protection range of the present invention as.Those skilled in the art should know various variant of the present invention, be equal to replacement and modification.For example, data-signal is the non-return-to-zero form.The speed of data-signal is 2.5G bits per second (Gbps).Data power density reduces along with the increase of frequency, when 2.5GHz, reduces to 0 basically.In order to select subcarrier signal, radio frequency band filter 224 or 424 uses as follows-and the 3dB transmission bandwidth equals the situation of subcarrier data rate:
Δ f
SC=R
SC(formula 6)
Δ f wherein
ScFor radio frequency band filter 224 or 424-the 3dB transmission bandwidth, R
ScBe subcarrier data rate.Radio frequency band filter 224 or 424 allows subcarrier signal and a part of data-signal to pass through.The partial data signal that passes through is the noise that causes subcarrier signal to worsen.At frequency domain, the subcarrier signal power through band pass filter is:
P
SC≈ ρ
SC(f
SC) * R
SC(formula 7)
P wherein
ScBe subcarrier power, ρ
Sc(f
Sc) be the subcarrier power density on the subcarrier frequency.At frequency domain, the noise power of the data-signal through band pass filter is:
P
N≈ ρ
DATA(f
SC) * R
SC(formula 8)
P wherein
NBe noise power, ρ
DATA(f
SC) be the Carrier To Noise Power Density of subcarrier frequency.The signal to noise ratio of subcarrier signal is:
Wherein SNR and subcarrier data rate R
SCBe inversely proportional to.Of Fig. 5, when subcarrier frequency in kHz or MHz scope, spectrum density ρ
DATACan be approximated to be:
ρ
DATA(f
SC) ≈ ρ
DATA(0) (formula 10)
In addition, total data signal power P
DATAEqual ρ in the frequency interval
DATAIntegration.Like Fig. 5, can be approximated to be:
P
DATA≈ ρ
DATA(0) * 0.5 * R
DATA(formula 11)
R wherein
DATAMain speed for data-signal.According to formula 5 and 9-11, the signal to noise ratio of subcarrier signal is:
For high quality detection, the signal to noise ratio among the embodiment should equal 20 decibels at least.Especially,
SNR=100 (formula 13)
Therefore, subcarrier data rate R
SCWith main data rate R
DATAHave following relation:
R
SC≤10
-4* R
DATA(formula 14)
In order to satisfy the requirement of formula 4 and 13, formula 14 has limited subcarrier data rate.For the high quality detection of data-signal, need satisfy the requirement of formula 4 usually.For the high quality detection of subcarrier signal, need satisfy the requirement of formula 13 usually.For while transmission of data signals and subcarrier signal, the condition of formula 4 and formula 13 needs to satisfy simultaneously.For example, main data rate equals 2.5Gbps, and subcarrier data rate just should be no more than 250kbps.And for example, main data rate equals 100Mbps, and maximum subcarrier data rate just should be no more than 10kbps.
In contrast, when subcarrier frequency increases to GHz by kHz or MHz, 2.4GHz for example, the then also corresponding raising of maximum subcarrier data rate.For example, of Fig. 5, work as f
SCDuring for 2.4GHz, general 26 decibels of Carrier To Noise Power Density is lower than f
SCWhen kHz-MHz, that is, and ρ
DATA(2.4GHz)=10
-26ρ
DATA(0) Carrier To Noise Power Density.Like this, according to formula 9, signal to noise ratio is 26 decibels, is higher than given subcarrier data rate, and maximum subcarrier data rate can be increased to 100Mbps, thus 20 decibels of signal to noise ratios of acquisitions needs.In addition, if maximum subcarrier data rate can not be used, then the disturbance of subcarrier modulation depth and data-signal will reduce.
Fig. 6 is the simplification power spectrum sketch map of subcarrier signal in the embodiment of the invention and the simplification frequency band limits characteristic sketch map of band pass filter.This only is an example, should not regard the restriction to claim protection range of the present invention as.Those skilled in the art should know various variant of the present invention, be equal to replacement and modification.Said subcarrier signal has power spectrum 610.For example, power spectrum 610 is with relevant at the 1Mbps of 2.41GHz subcarrier frequency data rate.Said radio frequency band filter has frequency band limits characteristic 620.For example, to have with 2.41GHz be center and the half-peak value full bandwidth (FWHM) that equals 1.6MHz to this frequency band limits characteristic 620.This radio frequency band filter can be used as radio frequency band filter 214,224,416 or 424.
Preceding text were explained, and here also will further stress, shown in Fig. 5 and Fig. 6 is embodiments of the invention, and these embodiment shall not be applied to the protection range of restriction claim of the present invention.Those skilled in the art should know various variant of the present invention, be equal to replacement and modification.For example, equal in frequency, less than or during greater than 2.5GHz, data power density almost is reduced to 0.Said subcarrier frequency can be chosen as the certain percentage that data power density almost is reduced to 0 o'clock frequency.For example, this percentage range is 80%～100%.
Another embodiment of the present invention has proposed a kind of processing method of optical-fiber network pilot signal; Comprise: receive first pilot signal; Handle and the relevant information of said first pilot signal, then at least based on exporting second pilot signal with the relevant information of said first pilot signal.Said method further comprises: receive said second pilot signal and first data-signal; Handle and said second pilot signal and the relevant information of said first data-signal, then at least based on exporting first light signal with said second pilot signal and the relevant information of said first data-signal.Said method further comprises: receive said first light signal, handle and the relevant information of said first light signal, then at least based on exporting first signal of telecommunication and second data-signal with the relevant information of said first light signal.Said method further comprises: receive said first signal of telecommunication, handle and the relevant information of said first signal of telecommunication, export the 3rd pilot signal then.Said second pilot signal is relevant with first subcarrier frequency; Said first data-signal is relevant with first data bandwidth.Said first data bandwidth comprises: first data frequency, the power density of said first data-signal on said first data frequency near 0.The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1.
Another embodiment of the present invention has proposed a kind of transmission method of optical-fiber network pilot signal; Comprise: receive first pilot signal; Handle and the relevant information of said first pilot signal, then at least based on exporting second pilot signal with the relevant information of said first pilot signal.Said method further comprises: receive said second pilot signal and first data-signal; Handle and said second pilot signal and the relevant information of said first data-signal, then at least based on exporting first light signal with said second pilot signal and the relevant information of said first data-signal.Said second pilot signal is relevant with first subcarrier frequency; Said first data-signal is relevant with first data bandwidth.Said first data bandwidth comprises: first data frequency, the power density of said first data-signal on said first data frequency near 0.The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1.
Another embodiment of the present invention has proposed a kind of method of reseptance of optical-fiber network pilot signal; Comprise: receive first light signal; Handle and the relevant information of said first light signal, then at least based on exporting first signal of telecommunication and second data-signal with the relevant information of said first light signal.Said method further comprises: receive said first signal of telecommunication, handle and the relevant information of said first signal of telecommunication, export the 3rd pilot signal then.The process information of said first signal of telecommunication comprises said first signal of telecommunication of filtration, and filtration first subcarrier frequency relevant with said first signal of telecommunication.Said second data-signal is relevant with first data bandwidth; Said first data bandwidth comprises maximum data frequency.The ratio span of said first subcarrier frequency and said maximum data frequency is 0.8～1.
Embodiments of the invention have lot of superiority.Embodiments of the invention use the subcarrier frequency of the peak frequency that is lower than data- signal 250 or 450 frequency bands slightly, and the rear portion of this subcarrier power spectrum and data power spectrum is overlapping.The data power density at this rear portion is far below the low-frequency data power density.For example, this low frequency is in kHz or MHz scope.Some embodiment of the present invention provides subcarrier signal, and itself and said data-signal are shared all or part of photoelectric signal converter, electro-optical signal converter and other photoelectricity or electric light transition components.The embodiment of the invention has lowered transmission greatly and has received the cost of pilot signal.Some embodiment of the present invention provides at f
SCLow data power density.Said pilot signal has than high s/n ratio and can be with higher speed rates, for example, and to be higher than the speed rates of 1Mbps.Embodiments of the invention provide sub-carrier modulation by a narrow margin.Said main data channel only receives very little disturbances.For example, the disturbance of luminous power is less than 1dB.Some embodiment of the present invention also provides easy configuration to realize with simplifying.
Fig. 7 is the rough schematic view that transmits and receive signal in the prior art in the ISM frequency band.System 700 comprises radio frequency sending set 710, radio-frequency transmitter 720 and antenna 730 and 740.For example, radio frequency sending set 710 converts baseband signal 750 to radiofrequency signal 752.The reference carrier frequency of radiofrequency signal 752 is 2.4GHz～2.483GHz.For example, this frequency range belongs to industry, scientific research and medical treatment (ISM) frequency band that does not need license to use in the U.S..And for example, radio frequency sending set 710 comprises the rf transmitter chip of ISM frequency band.Radiofrequency signal 752 is propagated in the air as transmission medium by antenna 730.Receive the radiofrequency signal of propagating by antenna 740.For example, antenna 740 is positioned at more than 730 meters distant places to hundreds of rice of antenna.As response, antenna 740 is to radio-frequency transmitter 720 output radiofrequency signals 754.Radio-frequency transmitter 720 converts radiofrequency signal 754 to baseband signal 756.For example, radio-frequency transmitter 720 comprises the radio-frequency transmitter chip of ISM frequency band.For another example, the communication between antenna 730 and the antenna 740 is two-way.Radio-frequency transmitter 710 is the right parts of radio frequency sending set/receiver, and radio frequency sending set 720 is the right parts of radio frequency sending set/receiver.
Fig. 8 is that the optical-fiber network of simplifying in another embodiment of the present invention connects sketch map.This only is an example, should not regard the restriction to claim protection range of the present invention as.Those skilled in the art should know various variant of the present invention, be equal to replacement and modification.System 800 comprises transmitter system 810, receiver system 820 and optical link 830.Transmitter system 810 further comprises electro-optical signal converter 812 and radio frequency sending set 870.Receiver system 820 further comprises photoelectric signal converter 822, radio-frequency transmitter 880 and data recovery system 828.Although above content with assembly 810,812,820,822,828,830,870 and 880 explanations, still has various variants, is equal to replacement and modification.Some assembly can merge each other.Other assembly can be added in the system 800.According to the difference of embodiment, can substitute one or more assemblies.Below these assemblies will be described in further detail.
Radio frequency sending set 870 receives pilot signal 840 and converts thereof into radiofrequency signal 842.In one embodiment, radiofrequency signal 842 is a subcarrier signal.Among another embodiment, the reference carrier frequency of radiofrequency signal 842 is 2.4GHz～2.483GHz.For example, carrier frequency is in the ISM wave band.Among another embodiment, generate pilot signal 840 by control circuit.Among another embodiment, radio frequency sending set 870 is as the subcarrier transmission system.Among another embodiment, radio frequency sending set 870 comprises radio frequency sending set 710.For example, radio frequency sending set 870 can be used for WLAN, bluetooth and/or Wireless USB.In another example, radio frequency sending set 870 uses amplitude shift keying method (ASK), frequency shift keying (FSK) or phase-shift keying modulation systems such as (PSK).
At electro-optical signal converter 812, data-signal 850 merges with subcarrier signal 842.Signal after the merging is converted into light signal 860.For example the frequency of subcarrier signal 842 is positioned at the frequency response range of electro-optical signal converter 812.For another example, electrical to optical converter 812 has the frequency response range that is up to 2.5Gbps.And for example, electro-optical signal converter 812 is analogue systems, and its output signal is directly proportional with input signal.Light signal 860 is corresponding to the luminous power of data-signal 850 with corresponding to the stack of the luminous power of subcarrier signal 842.For example, this is superposed to linearity.Aspect luminous power, the ratio ranges of subcarrier signal 842 and data-signal 850 is 1%～10%.This ratio also often is called as subcarrier modulation depth.
Light signal 860 receives through optical link 830 transmission and by receiver system 820.In one embodiment, optical link 830 comprises optical fiber.For example, optical fiber is as transmission medium, and transmission range can reach the hundreds of kilometer.At receiver system 820, light signal 860 converts the signal of telecommunication 862 to by photoelectric signal converter 822.The part of the signal of telecommunication 862, that is, signal 844 is received by radio-frequency transmitter 880.For example, radio-frequency transmitter 880 comprises band pass filter.Radio-frequency transmitter 880 extracts subcarrier signal and converts thereof into pilot signal 846 from this part signal 844.In one embodiment, radio-frequency transmitter 880 is as the subcarrier receiving system.Among another embodiment, radio-frequency transmitter 880 comprises radio-frequency transmitter 720.For example, radio-frequency transmitter 880 can be used for WLAN, bluetooth and/or Wireless USB.In another example, radio-frequency transmitter 880 uses amplitude shift keying method (ASK), frequency shift keying (FSK) or phase-shift keying demodulation modes such as (PSK).Pilot signal 846 is the backup of pilot signal 840.For example, pilot signal 846 is sent to control circuit.In addition, other part of signal 862 is received by clock and data recovery system 828.Clock and data recovery system 828 can reduce distorted signals and generate data-signal 852.Data-signal 852 is backups of data-signal 850.
Fig. 9 is that the optical-fiber network of simplifying in another embodiment of the present invention connects sketch map.This only is an example, should not regard the restriction to claim protection range of the present invention as.Those skilled in the art should know various variant of the present invention, be equal to replacement and modification.System 900 comprises transmitter system 910, receiver system 920 and optical link 930.Transmitter system 910 further comprises lasing light emitter 912, electro-optical signal modulator 914 and radio frequency sending set 970.For example lasing light emitter 912 comprises laser diode.Receiver system 920 comprises photoelectric signal converter 922, radio-frequency transmitter 990 and clock and data recovery system 928.Although above content with assembly 910,912,914,920,922,928,930,970 and 990 explanations, still has various variants, is equal to replacement and modification.Some assembly can merge each other.For example, can lasing light emitter 912 and electro-optical signal modulator 914 be combined.Other assembly can be added in the system 900.According to the difference of embodiment, can substitute one or more assemblies.Below these assemblies will be described in further detail.
Radio frequency sending set 970 receives pilot signal 940 and is converted into radiofrequency signal 942.In one embodiment, radiofrequency signal 942 is a subcarrier signal.Among another embodiment, the reference carrier frequency of radiofrequency signal 942 is 2.4GHz～2.483GHz.For example, this carrier frequency is in ISM band.Among another embodiment, generate pilot signal 940 by control circuit.Among another embodiment, radio frequency sending set 970 is as the subcarrier transmission system.Among another embodiment, radio frequency sending set 970 comprises radio frequency sending set 710.For example, radio frequency sending set 970 can be used for WLAN, bluetooth and/or Wireless USB.In another example, radio frequency sending set 970 uses amplitude shift keying method (ASK), frequency shift keying (FSK) or phase-shift keying modulation systems such as (PSK).
Lasing light emitter 912 receives subcarrier signal 942 and generates laser signal 980.The intensity of subcarrier signal 942 modulated laser signals 980, for example, lasing light emitter 912 comprises laser diode.For electro-optical signal modulator 914 provides laser signal.The data-signal 950 that modulator 914 usefulness receive is modulated these laser signals and is converted the data-signal that receives 950 to light signal 952.For example, the frequency range of subcarrier signal 942 is positioned at the frequency response range of lasing light emitter 912 and electro-optical signal modulator 914 at 2.4GHz～2.483GHz.For another example, subcarrier modulation depth is 1%～10%.
Light signal 952 receives through optical link 930 transmission and by receiver system 920.In one embodiment, optical link 930 comprises optical fiber.For example, optical fiber is as transmission medium, and transmission range can reach the hundreds of kilometer.At receiver system 920, light signal 952 converts the signal of telecommunication 962 into by photoelectric signal converter 922.The part of the signal of telecommunication 962, promptly signal 964, received by radio-frequency transmitter 990.For example radio-frequency transmitter 990 comprises band pass filter.Radio-frequency transmitter 990 extracts subcarrier signal and converts thereof into pilot signal 966 from this part signal 964.In one embodiment, radio-frequency transmitter 990 is as the subcarrier receiving system.Among another embodiment, radio-frequency transmitter 990 comprises radio-frequency transmitter 720.For example, radio-frequency transmitter 990 can be used for WLAN, bluetooth and/or Wireless USB.In another example, radio-frequency transmitter 990 uses amplitude shift keying method (ASK), frequency shift keying (FSK) or phase key monitoring method demodulation modes such as (PSK).Pilot signal 966 is the backup of pilot signal 940.For example, pilot signal 966 is sent to control circuit.In addition, other part of signal 962 is received by clock and data recovery system 928.Clock and data recovery system 928 can reduce distorted signals and generate data-signal 954.Data-signal 954 is backups of data-signal 950.
Preceding text were explained, and here also will further stress, shown in Fig. 8 and Fig. 9 is embodiments of the invention, and these embodiment shall not be applied to the protection range of restriction claim of the present invention.Those skilled in the art should know various variant of the present invention, be equal to replacement and modification.For example, system 800 connects 200 example for light.In addition, system 900 connects 400 example for light.
An alternative embodiment of the invention has proposed a kind of processing method of optical-fiber network pilot signal; Comprise: receive first pilot signal; Handle and the relevant information of said first pilot signal; At least based on exporting second pilot signal, receive said second pilot signal and first data-signal then with the relevant information of said first pilot signal.Said method further comprises: handle and said second pilot signal and the relevant information of said first data-signal; At least based on exporting first light signal, receive said first light signal and processing and the relevant information of said first light signal then with said second pilot signal and the relevant information of said first data-signal.Said method further comprises: based on exporting first signal of telecommunication and second data-signal with the relevant information of said first light signal, receive said first signal of telecommunication at least, handle the information relevant with said first signal of telecommunication then and export the 3rd pilot signal.Said second pilot signal is relevant with first subcarrier frequency.Said first data-signal is relevant with first data bandwidth; Said first data bandwidth comprises first data frequency.At said first data frequency, the power density of said first data-signal is substantially equal to 0.The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1, and the said first subcarrier frequency scope is 2.4GHz～2.483GHz.For example, system 800 and/or system 900 can carry out said method.
Another embodiment of the present invention has proposed a kind of transmission method of optical-fiber network pilot signal; Comprise: receive first pilot signal; Handle and the relevant information of said first pilot signal, then at least based on exporting second pilot signal with the relevant information of said first pilot signal.Said method further comprises: receive said second pilot signal and data-signal; Handle the information relevant with said data-signal, then at least based on the information output light signal relevant with said data-signal with said second pilot signal with said second pilot signal.Said second pilot signal is relevant with subcarrier frequency; Said data-signal is relevant with data bandwidth.Said data bandwidth comprises: data frequency, the power density of said data-signal on said data frequency near 0.The ratio span of said subcarrier frequency and said data frequency is 0.8～1, and said subcarrier frequency scope is 2.4GHz～2.483GHz.For example, system 800 and/or system 900 can carry out said method.
Another embodiment of the present invention has proposed a kind of method of reseptance of optical-fiber network pilot signal, comprising: receiving optical signals, handle the information relevant, then at least based on the information output signal of telecommunication and the data-signal relevant with said light signal with said light signal.Said method further comprises: receive the said signal of telecommunication, handle the information relevant with the said signal of telecommunication, output monitoring signal then.The process information of the said signal of telecommunication comprises the said signal of telecommunication of filtration, and the filtration subcarrier frequency relevant with the said signal of telecommunication.Said data-signal is relevant with data bandwidth; Said data bandwidth comprises data frequency.At said data frequency, the power density of said data-signal is substantially equal to 0.The ratio span of said subcarrier frequency and said data frequency is 0.8～1, and said subcarrier frequency scope is 2.4GHz～2.483GHz.For example, system 800 and/or system 900 can carry out said method.
The embodiment of the invention has lot of superiority.Embodiments of the invention can realized high-performance under the condition cheaply.Some embodiment of the present invention uses for wireless communication industry at commercial available radio frequency (RF) transmitter and receiver.For example, in the ISM frequency band, carry out radio communication.Said radio frequency sending set and receiver comprise integrated circuit (IC) chip.These IC chips can be that optical communication provides superior performance with the low price.
The above only is several specific embodiment of the present invention, and those skilled in that art are to be understood that the present invention can also have other implementation method a lot of and the foregoing description equivalence.Therefore, above-mentioned specific embodiment shall not be applied to restriction protection scope of the present invention, and protection scope of the present invention should be as the criterion with the said scope of claim.
Claims (19)
1. a device that is used to handle the optical-fiber network pilot signal is characterized in that, said device comprises:
The subcarrier transmission system is used to receive first pilot signal, obtains first subcarrier according to the first pilot signal modulated radio signal, and first subcarrier that modulation is obtained carries out the radio frequency bandpass filtering, exports second pilot signal;
The electric light converting system is used to receive said second pilot signal and first data-signal and exports first light signal;
Photo-translating system is used to receive said first light signal and exports first signal of telecommunication and second data-signal;
The subcarrier receiving system is used to receive said first signal of telecommunication, and first signal of telecommunication is carried out radio frequency bandpass filtering and radio demodulating, exports the 3rd pilot signal;
Optical link is connected to said electric light converting system and photo-translating system;
Wherein said second pilot signal is relevant with first subcarrier frequency;
Said first data-signal is relevant with first data bandwidth, and said first data bandwidth comprises first data frequency; The power density of said first data-signal on said first data frequency near 0;
The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1;
The said first subcarrier frequency scope is 2.4GHz～2.483GHz.
2. device according to claim 1 is characterized in that, said first light signal is relevant with the disturbance of said first data-signal; Said disturbance is less than or equal to 1dB.
3. device according to claim 1 is characterized in that, said first light signal is relevant with the signal to noise ratio of said first pilot signal, and said signal to noise ratio is more than or equal to 20dB.
4. device according to claim 1 is characterized in that, said first data frequency is and the relevant peak frequency of said first data bandwidth.
5. device according to claim 4 is characterized in that, said first data-signal is that the non-return-to-zero form and first data rate are the 2.5G bits per second.
6. device according to claim 5 is characterized in that, said first light signal is relevant with the disturbance of said first data-signal, and said disturbance is less than or equal to 1dB; Said first light signal is relevant with the signal to noise ratio of said first pilot signal, and said signal to noise ratio is more than or equal to 20dB.
7. device according to claim 1 is characterized in that, said subcarrier transmission system comprises the radio frequency transmitter in the ISM frequency band.
8. device according to claim 1 is characterized in that, said subcarrier receiving system comprises the radio frequency receiver in the ISM frequency band.
9. device according to claim 1 is characterized in that,
Said the 3rd pilot signal is identical with said first pilot signal;
Said second data-signal is identical with said first data-signal.
10. device according to claim 1 is characterized in that, said photo-translating system comprises:
Photoelectric signal converter is used to receive said first light signal and exports said first signal of telecommunication and second signal of telecommunication;
The clock and data recovery system is used to receive said second signal of telecommunication and exports said second data-signal.
11. device according to claim 1 is characterized in that, said electric light converting system comprises:
Lasing light emitter is used to receive said second pilot signal;
The electro-optical signal modulator is connected in said lasing light emitter, is used to receive said first data-signal at least and exports said first light signal.
12. device according to claim 1 is characterized in that, said electric light converting system comprises: electro-optical signal converter is used to receive said second pilot signal and said first data-signal and exports said first light signal.
13. a method that is used to handle the optical-fiber network pilot signal is characterized in that, said method comprises:
Receive first pilot signal;
Obtain first subcarrier according to the first pilot signal modulated radio signal, first subcarrier that modulation is obtained carries out the radio frequency bandpass filtering, exports second pilot signal;
Receive said second pilot signal and first data-signal;
Export first light signal according to said second pilot signal and said first data-signal;
Receive said first light signal;
Export first signal of telecommunication and second data-signal according to said first light signal;
Receive said first signal of telecommunication;
First signal of telecommunication is carried out radio frequency bandpass filtering and radio demodulating;
Export the 3rd pilot signal;
Wherein said second pilot signal is relevant with first subcarrier frequency;
Said first data-signal is relevant with first data bandwidth, and said first data bandwidth comprises first data frequency; The power density of said first data-signal on said first data frequency near 0;
The ratio span of said first subcarrier frequency and said first data frequency is 0.8～1;
The said first subcarrier frequency scope is 2.4GHz～2.483GHz.
14. a device that is used to transmit the optical-fiber network pilot signal is characterized in that, said device comprises:
The subcarrier transmission system is used to receive first pilot signal, obtains first subcarrier according to the first pilot signal modulated radio signal, and first subcarrier that modulation is obtained carries out the radio frequency bandpass filtering, exports second pilot signal;
The electric light converting system is used to receive said second pilot signal and data-signal and exports light signal;
Wherein said second pilot signal is relevant with first subcarrier frequency;
Said data-signal is relevant with data bandwidth, and said data bandwidth comprises data frequency; The power density of said data-signal on said data frequency near 0;
The ratio span of said first subcarrier frequency and said data frequency is 0.8～1;
The said first subcarrier frequency scope is 2.4GHz～2.483GHz.
15. device according to claim 14 is characterized in that, said subcarrier transmission system comprises the radio frequency transmitter in the ISM frequency band.
16. device according to claim 15 is characterized in that, said data frequency is the peak frequency relevant with said data bandwidth.
17. a device that is used to receive the optical-fiber network pilot signal is characterized in that, said device comprises:
Photo-translating system is used for receiving optical signals and exports the signal of telecommunication and data-signal; Wherein, The source of said light signal is: the subcarrier transmission system receives first pilot signal; Obtain first subcarrier according to the first pilot signal modulated radio signal, first subcarrier that modulation is obtained carries out the radio frequency bandpass filtering, exports second pilot signal; Second pilot signal is relevant with first subcarrier frequency, and the electric light converting system is with second pilot signal and data-signal merging and convert said light signal into;
The subcarrier receiving system is used to receive the said signal of telecommunication, and the said signal of telecommunication is carried out radio frequency bandpass filtering and demodulation, the output monitoring signal;
Said subcarrier receiving system comprises the band pass filter relevant with first subcarrier frequency;
The data-signal of said photo-translating system output is relevant with data bandwidth, and said data bandwidth comprises data frequency; The power density of the data-signal of said photo-translating system output on said data frequency near 0;
The ratio span of said first subcarrier frequency and said data frequency is 0.8～1;
The said first subcarrier frequency scope is 2.4GHz～2.483GHz.
18. device according to claim 17 is characterized in that,
Said subcarrier receiving system comprises the radio frequency receiver in the ISM frequency band;
Said radio frequency receiver comprises the band pass filter relevant with first subcarrier frequency.
19. device according to claim 17 is characterized in that, said data frequency is the peak frequency relevant with said data bandwidth.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56789204P | 2004-05-03 | 2004-05-03 | |
| US60/567,892 | 2004-05-03 | ||
| US11/071,399 US7509047B2 (en) | 2004-03-12 | 2005-03-02 | System and method for subcarrier modulation in ISM band as supervisory channel |
| US11/071,399 | 2005-03-02 | ||
| PCT/CN2005/000615 WO2005107104A1 (en) | 2004-05-03 | 2005-04-30 | System and method for subcarrier modulation in ism band as supervisory channel |
Publications (2)
| Publication Number | Publication Date |
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| CN101133575A CN101133575A (en) | 2008-02-27 |
| CN101133575B true CN101133575B (en) | 2012-06-20 |
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| CN2005800488391A Expired - Fee Related CN101133575B (en) | 2004-05-03 | 2005-04-30 | System and method for subcarrier modulation in ISM band as supervisory channel |
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| CN (1) | CN101133575B (en) |
| AT (1) | ATE419686T1 (en) |
| DE (1) | DE602005012077D1 (en) |
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| US10551640B2 (en) * | 2016-11-21 | 2020-02-04 | Futurewei Technologies, Inc. | Wavelength division multiplexed polarization independent reflective modulators |
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| CN1129870A (en) * | 1994-09-15 | 1996-08-28 | 美国电报电话公司 | Improved subcarrier multiple access passive optical network |
| EP1035668A2 (en) * | 1999-03-12 | 2000-09-13 | Marconi Communications Limited | Optical signal transmission system |
| US20020141408A1 (en) * | 2001-01-30 | 2002-10-03 | Gee-Kung Chang | Optical layer multicasting using multiple sub-carrier headers with header detection, deletion, and insertion via transmit single sideband optical processing |
| JP2003298540A (en) * | 2002-03-29 | 2003-10-17 | Kddi Corp | Data transmission system, transmission method and node for optical network supervisory control signal |
| US6639703B1 (en) * | 1999-03-18 | 2003-10-28 | Cisco Systems (Sweden) Aktiebolag | Receiver transponder for protected networks |
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2005
- 2005-04-30 AT AT05745225T patent/ATE419686T1/en not_active IP Right Cessation
- 2005-04-30 DE DE602005012077T patent/DE602005012077D1/en active Active
- 2005-04-30 CN CN2005800488391A patent/CN101133575B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129870A (en) * | 1994-09-15 | 1996-08-28 | 美国电报电话公司 | Improved subcarrier multiple access passive optical network |
| EP1035668A2 (en) * | 1999-03-12 | 2000-09-13 | Marconi Communications Limited | Optical signal transmission system |
| US6639703B1 (en) * | 1999-03-18 | 2003-10-28 | Cisco Systems (Sweden) Aktiebolag | Receiver transponder for protected networks |
| US20020141408A1 (en) * | 2001-01-30 | 2002-10-03 | Gee-Kung Chang | Optical layer multicasting using multiple sub-carrier headers with header detection, deletion, and insertion via transmit single sideband optical processing |
| JP2003298540A (en) * | 2002-03-29 | 2003-10-17 | Kddi Corp | Data transmission system, transmission method and node for optical network supervisory control signal |
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| Publication number | Publication date |
|---|---|
| ATE419686T1 (en) | 2009-01-15 |
| CN101133575A (en) | 2008-02-27 |
| DE602005012077D1 (en) | 2009-02-12 |
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